Electromagnetic fuel pump



Nov. 22, 1932. P. s. TICE ELECTROMAGNETIC FUEL PUMP Filed Feb. 13, 19286 Sheets-Sheet 1 Nov. 22, 1932. C 1,888,250

ELECTROMAGNETIC FUEL PUMP Filed Feb. 13. 1928 6 Sheets-Sheet 2 was: @MW

Nov. 22, 1932. P. s. TlCE ELECTROMAGNETIC FUEL PUMP 6 Sheets-Sheet FiledFeb. 13, 1928 6/ VIE/m \v Nov. 22, 1932. CE 1,888,250

ELECTROMAGNETIC FUEL PUMP Filed Feb. 13. 1928 6 Sheets-Sheet 4 Nov. 22,1932. P. s. TlCE ELECTROMAGNETIC FUEL PUMP Filed Feb. 13, 1928 6Sheets-Sheet 5 ,zvflezr/i'az". fercbflai 13.22 '09 Nov. 22, 1932. P. s.TlCE ELECTROMAGNETIC FUEL PUMP Filed Feb. 15, 1928 6 Sheets-Sheet 6'172%? 71%02. ferazflaZ 5120a Wzesa @lifim 83 84/7 5%02226 z 5..

Patented Nov. 22, 1932 UNITED STATES PATENT OFFICE PERQIVAL S. TICE, OFCHICAGO, ILLINOIS, .ASSIGNOR T STEWART-WARNER COBPOBIL- TION, OFCHICAGO, ILLINOIS, A CORPORATION OF VIRGINIA ELECTROMAGNETIC FUEL PUMPApplication filed February 13, 1928. Serial No. 253,974.

The purpose of this invention is to provide an improved construction forfeeding fuel from low level source to the carburetor of an internalcombustion engine, the same comprising an electromagnetic pumpingdevice. It consists in the elements and features of construction shownand described as indicated in the claims,

In the drawings Figure l is a diagrammatic view showing one form ofinstallation of the invention.

Figure 2 is a similar view showing a second form of such installation.

Figure 3 is a similar View showing a third andin general preferred formof installation and construction.

Figure 4 is a vertical section axial with respect to the cylinder of aform of electromagnetic pumping device embodying the invention designedand adapted to be installed submerged in the main tank from which thefuel is to be pumped for supplying the carbureter,

Figure 5 is a section at the line 55 on Figure 4.

Figurefi is a section at the line 66 on Figure 4:.

Figure 7 is a detail section at the line 7--7 on Figure 4.,

Figure 8 is a section at the line 8-8 on Figure 1.

Figure 9 is a section at the line 99 on Figure 1.

Figure 10 is a section axial with respect to the venturi of the fuelintake passage of the engine and with respect to the pumping device, ofa structure embodying the invention as in the installation shown inFigure 3 in which the electromagnetic pumping device and the governorare both embodied in the unitary carbureter structure.

Figure 11 is a section at the line 11-11 on Figure 10.

Figure 1:2 is a section at the line 1212 on Figure 10.

Figure-13 is a wiring diagram of the form shown in Figures 10, 11 and12.

Figure 14 is a detail section at the line 14-44 on Figure 9.

Figure 15 is a section at the line 1515 on Figure 14-.

Figure 16 is a view corresponding to Figure 4 showing a modification ofthe pumping device adapted to be installed submerged in the fuel tank.

Figure 17 is a top plan view of the construction shown in Figure 16 asat plane indicated by the line 1717, that is with the connection fittingdetached,

Figure 18 is a section at the line 1818 on Figures 16 and 17.

of the middle portion of the construction shown in Figure 16.

Figure 20 is a section at the line 20-20 on Figure 18.

Figure 21 is a section at the line 21-21 on Figure 12 on an enlargedscale for showing the alternating switch.

Figure 22 is a section at the line 22-422 on Figure 11.

Figure 23 is a section at the line 23-23 on Figure 19.

Figure 24 is a view looking in the direction of the arrow, 24, on Figure10 with the bottom detachable parts removed.

The structure as illustrated in Figures 1 and 4 will first be described.

In this embodiment of the invention the carbureter of the engine to beserved is seen at A; the main fuel tank usually carried at the rear ofthe vehicle to be served is seen at B; the pumping device in itsentirety is indicated at C, where it is seen submerged in the fuel inthe tank, B, and connected by a pipe, 10, leading out pf the top of thetank with a pipe, 11, for conducting the fuel to a local fuel container,12, of small capacity, mounted in proximity to the engine as at thefront of the dash and under the cowl, and connected by the pipe, 13, fordelivering the fuel by gravity to the carburetor.

In this installation the governing device indicated in its entirety onFigure 1 by reference letter, D, is mounted on the container, 12,hereinafter more particularly identified as consisting of a casing, 90,having chainhers, 91 and 98, for containing a limited quantity of fuelpumped thereto.

Figure 19 is a detail inverted plan view hating attraction.

The construction of the pumping device will first be described indetail. It is of the general character of an electromagnetic pump inwhich the electromagnetic elements are of quasi solenoid type; that is,the llOD. core, 40, encompassed by the circuit windings, ll, 41, ishollow, and the armature element, 42, is adapted to telescope with thehollow core which has its ends fitted with pole pieces, 43, re, betweenwhich the armature element, 42, has a short range of reciprocation inthe tubular core, lO, which serves also as a pump barrel or cylinder inwhich the armature element, l2, operates as a piston, being suitablyprovided with packing rings as indicated at is. The pole pieces, 43, as,are each apertured as seen at 43 for flow of the fuel pumped into andout of the cavities, do, 45, by the armature acting as a piston andreciprocating the short distance shown of the excess of length of theinterval between the pole pieces and the length of the armature pistonGuided in the pole pieces is an axially positioned rod, l6, on which thearmature piston is mounted, and about this axial guide, as it may becalled, ol' the armature piston, there are coiled springs, 47, 47, whichare accommodated at the opposite ends in axial recesses, 22*, 42 in thepiston armature, said springs reacting between the bottoms of theserecesses and the pole pieces respectively, tending to position thearmature piston equidistantly between the two pole pieces, and sotending return it to this position when the pole piece which hasattracted it in one direction, compressing the spring at side, isdie-energized by the interruption of the current through the circuitwinding at that endof the magnet. The tubular core member, 40, isadapted for retaining the circuit windings by having titted securely onit midway in its length an iron annular disk, 4-8, forming a spool headbetween the two winds; similar iron spool heads, 48, 428*, are securelyon the opposite outer ends of the pole pieces, d3,

The entire electromagnet assembly as thus described is encompassed by asleeve, l9, which is titted snugly to the spool heads, 48,

\ e8 48 and at the right hand end (referring to Figure 4) there issecured an insulating disk, 50, upon which is mounted a snap over switchmember, 51, hereinafter more particularly described, which is operatedby the thrust of the rod, 46, upon the movement of the armature pistonunder the alternating attraction of the opposite pole pieces for sittingthe current back and forth between the two circuit windings to causesaid alterlhe assembly encompassed and made securely unitary by thesleeve, 49, is enclosed in a casing, 60, in which it is fitted so as topartition the main cavity of the casing from the cavities, 45, 4:5, fromwhich the pipe, it), leads for conducting the detail in its relation tothe nessnso fuel on its way to the carbureters above described. I

llt may be understood that the entire pump structure as seen in Figurei: being submerged in the main tank, derives fuel supply through afilter screen, 64, mounted on an annular bottom flange, 65, of thecasing, 60, and enclosing an entrance chamber, 61, from which the fuelis drawn alternately into the cavities, lf), $25, by the alternatingstrokes of the piston member, 42, the fuel entering past check valves,67, 67, and being discharged from the cavities, 3:5, to, respectively,past check valves, 68 and 69, (see Fig. 5) into the passage, 62, formedin a boss, 66, at the upper side 01' the casing, 60, from which passage,62, the pipe, 10, leads to the carbureter,

"lhe snap switch will now be described in parts of the circuit which itconnects. conductor, 70, leads from the engine ignition switch, notshown, through the governing switch, D, hereinafter described, and intoand through the pipe, 10, into the chamber, 62, and therein to abindingpost, 71, mounted in the partition wall, 69, at the inner side ofwhich in the chamber, 15, said binding post is in con tact with theresilient tongue, 72, of a bracket, 73, which is mounted on theinsulating disk, 50. 'lo this bracket the snap lever, 51, is pivoted atits upper end, said snap lever being forked at the lower end forcarrying at that end a roller, 74, one end of which obtains its journalbearing in an elongated slot, 75, in one of the fork arms, 76, itsjournal bearing at the other end in the other fork arm being loose topermit the first mentioned end to play in the slot without cramping thehearing at the opposite end; and a stretched spring, 77, connects thefirst mentioned end of the roller with the pivot of the lever at itsupper end to the bracket as mentioned. The rod, t6, carries a conoidalcam collar, 78, formed tapering from the maximum diameter midway of itslength, narrowing toward both ends. This cam collar is mounted on therod, 46, at such position that midway in the stroke of the piston, 42,said cam collar stands with the plane of its maxi mum diametercontaining the axis of the pivot of the lever, 51; and the length ofsaid lever from its pivot at the upper end to the mounting of theroller, 74 at its lower end is such that the spring, 77, operates tohold the roller stressed upwardly against the cam collar. Uponconsidering this construction it will be understood that when the rodcarrying the double cone is thrust by the armature piston from oneextreme position to the other, in passing the midway position it willforce the roller against the resistance of the stretched spring outwardfrom the axis of the cone, and upon the reaction of the spring pullingit back against slope of the cone the lever will be swung in theopposite direction from the thrust of the rod. On the insulating disk,50, there are mounted so as to project at opposite sides of the lever,51, spring contacts, 80, and 81, which are connected respectively bycircuit Wires, 82 and 83, with the outer coils of the windings, 41 and41, said windings have their innermost coils grounded by theirconnection to the core.

It will be seen from this construction that the, thrust of the armaturepiston upon its attraction by one of the magnet pole pieces upon theenergizing of that pole piece by the current through its winding willcause the operation of the snap switch to shift the current to the otherwinding, energizing the opposite pole piece which will thereupon retractthe armature piston, again reversing the connection, and thus thereciprocation of the armature piston will continue, the pumpingactionwill continue, pumpingthe fuel, until by any means or from anycause either the resistance of the fuel to the pumping action exceedsthe pumping capacity of the device, or the energizing circuit isint-errnpted otherwise than in the alternating manner described whichcausesthe reciprocation. The intent of the structure being to maintainthe pumping action in such manner as to maintain the supply of fuel tothe carburetor and to interrupt the pumping action when the supplyexceeds the carburetor requirements in the least degree, provision ismade for Interrupting the circuit by the action of the fuel pumped whenthe supply passes the predetermined limit of the requirement of thecarbureter. This interruption of the circuit is effected by thegoverning device which will now be described.

The governing device includes the casing, 90, of the container, 12, andparticularly the chamber, 91, therein, the outer side wall of whichcomprises a flexible diaphragm, 92, stressed inwardly by an exteriorspring, 93, reacting at its outer end against a spider or bridge member,90 mounted exteriorly on the casing. Binding posts, 96 and 96, set inthe casing and extending into the chamber, 91, at opposite points in itsperiphery, serve respectively for positioning in the chamber, 91, arigid contact, 94:, and the spring contact, 95, whose terminal buttons,94*- and 95, are normally in contact, the spring contact being connectedby a spacer, 97, with the center of the diaphragm, 92, so that thereaction of the spring, 93, tends to enforce the contact of the buttons,94 and 95. The casing has a chamber, 98, extending up alongside thechamber, 91, to a height determined upon for adapting said chamber, 98,to act as a stand pipe for liquid communicating with the chamber, 91,for exerting pressure on the diaphragm to expand said chamber, 91, andcause the diaphragm to withdraw the spacer, 9?, from the spring contact,95, and

permit the latter to react for separating the buttons, 9? and 95*, or ifthe spacer is attached to the spring contact, as it may be, to withdrawthe spring contact with the spacer and separate the buttons, breakingthe circuit. The casing, 90, as to both its chambers, 91 and 98, is incommunication through the pipe, 11, with the discharge of the pumpingdevice, said pipe being connected at the side of the casing, 90, througha nipple, 99, lead ing to a hollow boss, 99, which opens downwardly atthe center of the circular base, 90", of the casing, 90, which isperipherally flanged as seen at 90, and shouldered as seen at 90 forseating on and closing the upper end of a sediment cup, 90, betweenwhich and the casing there is clamped a strainer, 90, and a gasket, 90,the strainer being clamped at the end of the central boss, 99 by a T-fitting 11 screwed into the boss and constituting the continuation ofthe entrance passage for liquid which is thus introduced below thestrainer and passes up through the latter into the chamber, 98, and.thence by ports, 99, in the partition,*99'-', into the chamber, 91.

In the installation illustrated in Figure 2 the sediment cup is omittedand the governor is mounted directly on the stand pipechamher-designated 98 in this forn1,at the lower end thereof asindicated by the spider, 9 1, and the spring, 923, seen in Figure 2, andthe said stand pipe chamber, 98', is made of suitable capacity andsuitably positioned with respect to the carburetor fuel nozzle indicatedat 100 to function as the customary carbureter float bowl for supplyingthe nozzle under governed hydrostatic pressure, the stand pipe level ofsaid chamber being the governed level of the customary float bowl, thefuel being delivered from this chamber to the fuel nozzle of thecarburcter under the same conditions as it is delivered from thecustomary float bowl to the fuel nozzle.

0f the installation seen diagrammatically in Figure 3 the detailconstruction may be understood from Figures 10, ll, 12, 22, 23 I and24e, as will 'now be described.

In this embodiment of the invention the electromagnetic pumping elementcomprises an energizing circuit winding, 200, wound between ironretaining rings or spool heads, 201, 202, upon a hollow core member,203, whose cavity from one end to a point somewhat past the middle ofthe length constitutes a piston chamber, 20%, in which there is fittedpiston-wise an armature element, 205, the remaining portion of saidcavity, which is somewhat less than half the axial extent of theencompassing circuit winding, which is occupied by a fixed magnet polepiece, 200, to which the armature piston, 205, is attracted when thecircuit is closed through the circuit winding, 200. A spring, 205 ,isprovided reacting on the armature piston for restoring it to normalposition, withdrawn from the 207, there is mounted pole piece, 206, whenthe circuit is interrupted by the action of the switch to be nowdescribed.

At the end of the core member opposite the pole piece, 206, there ismounted a segmental annular insulating plate, 207, which serves to stopthe outward-spring-caused stroke of the armature piston. On saidinsulating plate,

a switch lever, 20S, pivoted at one end as seen at 209 in Figure 12 on abracket, 210, mounted fixedly on'said insulating plate, 207, and incontact with a binding post, 210, to which is attached the circuit Wire,211, which leads from the ignition switch seen at M in Figure 3. Saidswitch lever extends across the axis of the core member and carries atits free end a roller, 212, which at rest position of the parts, when nocurrent is net circuit winding, and the armature piston is accordinglythrust by the spring, 203, against the inner side of the insulatingplate, 207, rests against the inner side of double cone boss, 213, ofinsulating material having a hollow stem, 21%, by means of which it ismounted centrally in the armature piston, 205, and co-operates with thepin, 20%, which projects rigidly from the pole piece, 206, into saidhollow stem for guiding the armature piston from which said double coneboss projects past the insulating plate, 207. At this position of theswitch lever it is in contact with the contact member, 215, to which isattached the circuit wire forming circuit winding, 200, whose inner endis grounded through the governing switch as hereinafter described; andin this position of the switch it closes the circuit through saidcircuit windings for energizing the magnet pole piece. The roller, 212,is journaled in the ends of the two parallel arms, 208 208", of theswitch lever, 208, and has one of its journal bearings slotted to permitthe roller journaled at its end to vibrhte toward and from thedoubleconed boss, 213, and a stretched spring, 216, connected to thatend of the roller journal and at the other end to the bracket, 210,operates for holding the roller stressed against the double cone withthe ellect that when the armature piston is pulled inward by theattraction or" the pole piece upon the closing of the circuit throughthe ignition switch by the governing switch ashereinafter described,energizing the circuit winding, 200, the roller being crowded out to theapex of the double cone, is retracted on the outer cone slope and theswitch lever, 208, is thus swung over to circuit-breaking position whereit is stopped by a projection, 217, on the bracket, 210. 'lhereupon thespring, 205*, retracts the armature piston to the initial positioncausing opposite action of the cooperating double cone and roller, i.e., swinging-the switch lever back to the circuit-closing position; andthus the armature piston is reciprocated rapidly passing through themag-4 spider serving also for having a pin,

so long as the circuit is closed through the governing switch andinterrupted only by the alternating switch above described.

The electromagnetic pumping device thus far described is fitted snuglyin a cylindrical cavity of the casing, 220, with one open end of whichthe pumping device is flush, the cavity of the casing beingcounter-bored the length over-all of the pumping device, leavin at theinner end of the cylindrical cavity a chamber, 221, in which thealternating switch device above described is situated. The casing, 220,has an exteriorly projecting hollow boss, 222, extending the entireheight of the casing at the side at which the chamber, 221, is situatedand extending also around the lower right-hand corner and along the sideof the casing as seen at 223, and open at the end at which the pumpingdevice is flush with the casing as above mentioned. At the upper sidethe casing has a hollow boss, 224,0pen at the same end as the boss, 222.A port, 225, affords communication of the chamber, 221, with the boss,222, at the upper end of the latter, and below that port there isinterposed in the boss, 222, a check valve, 226, open for liquid flowtoward the port, 225, and thereby into the chamber, 221; and from theupper side of that chamber a port, 227, controlled by a check valve,228, ah"ording communication with the cavity of the boss,22 l, thevalve, 228, opening for how the boss cavity and seating against reverseflow.

In this installation the governing switch element comprises thediaphragm, 230, mounted in position for closing the lower end of thefuel receiving cavity of the carburetor, comprising the standpipe orlevel overning chamber, 98 said diaphragm bemg clamped into placebetween gaskets, 230

111, with the spring 231,

230*, by the spider,

the under side of the interposed between diaphragm, through the centralhub of the spider, said clamping above the plate, 111, having adiaphragm a damping affording restricted central aperture, 111", accessto the diaphragm of the fuel in the standpipe or level governingchamber. This damping plate carries an insulating binding post, 232,onto the upper end of which there is secured one end of an upper contactmemher, 233, and below which there is secured one end of a lower springcontact'member, 235, said contact members both extending into alignmentwith the axis of the dia-- phragm where they are provided with con--tact buttons, 233 and 235, respectively, tacing each other,

the spring contact member 234,, projecting down through the aperture,111 in the damping plate, 111 for engagement with the diaphragm, 230, atthe center of the latter.

The circuit connection to the governing it and an adjusting screw actingassesso switch is made from the inner end of solenoid winding, 200, fromwhich as seen in Figure 18 the circuit wire is led out, insulated asindicated at 200 through the spool head 201, to an insulated contactbutton, 201*. A spring circuit wire, 237, is mounted rigidly in aconductive sleeve, 236, which is mounted in the insulating post, 232,carried by the damping plate, 111*, the upper end of the sleeve beingpeened over upon the contact member, 233, for securing the latter on thepost as above described. Said spring circuit wire extends up in thechamber, 08 and at its upper end is bent laterally as seen at 237*",:tor projecting into contact with the contact button, 201*; and forinsuring some stress of the end of the spring circuit wire against saidcontact button, there is provided an insulating abutn'ient, 260, mountedin the wall of the chamber, 98 against which the upr1ght portion of thespring circuit wire, 23?, 1s thrust by the button, 201 in applying andmounting the casing 220, on the outside or the chamber, 98

From this description it will be understood the circuit is groundedthrough the damping plate, 111, on which the spring contact, 235, ismounted below the insulating post, 232, and that the circuit is"normally closed through the governing switch by the action of thespring, 231, stressing the diaphragm upward and holding the contactbuttons, 233 235 in touch with each other; and that the circuit isbroken when the hydraulic pressure of the fuel pumped into the chamber,98 is sufiicient to overcome the spring and separate the contactbuttons, 233 ,235

in all the forms shown in the several installations illustrated inFigures 1, 2 and 8, it is of great advantage to employ a corn structionwhich is illustrated in Figure 3 and which will now be described, for apurpose which will appear as the description proceeds.

At the lower end of the level-governing chamber, 98 which functions as astand pipe for aliording hydrostatic head acting on the operatingdiaphragm of the governing switch in the constructions of Figures 10 and11, there is formed a hollow boss, 110, whose cavity, 110 is a part ofthe cavity 01 the level-gmerning chamber, and which is made open at thebottom of said boss for admitting the parts to be described, theopening, after said parts are introduced, being closed by a tightlyfitting stamped closure member, 111. The vertical axis of the cavity,110, of the boss in Figure 10, is in the vertical plane oi the axis ofthe fuel inlet port through the nipple, 255, and the latter port isfurnished with a check valve fitting, 256, in sorted and screwed in fromthe outer end of the nipple, 255, and comprising a checlr valve, 25?,opening for inflow and adapted to be adjusted to stop or restrict theinflow The inner end of the stem, 258, of the valve, 257., at what maybe regarded as the normal or rest position of the parts, with the valveopen for inflow or held open by inflow, bears against the upper end ofthe short arm, 259, of a weighted lever or pendulum, 260, which ispivoted at 261 and depends from its pivot toward the cavity, 110, or theboss, 110, having its lower end heavily weighted as seen at 262. Theposition of the parts seen in Figure with the weighted pendulum at itsnormal vertical position, is that which they will occupy when thevehicle whose engine is equipped with the device is traveling on thelevel road. When the vehicle is on descending grade, so that the fuelsupply tank at the rear is elevated and may be so much elevated that thefuel will flow by gravity, without the service or the pump to thecarburetor, and would eventually flood the carburetor, the movement ofthe pendulum from vertical position, operates to move the valve, towardclosed position, and to close it and hold it closed when the grade issuch as to elevate the fuel supply at the rear of the vehicle above thelevel the carburetor. The parts are dimensioned with relation to theusual distance of the fuel tanlr rearward from the carburetor so thatthe force exerted by the pendulum lever at the upper end of its shortarm against the stem of the valve, 257, for holdin the latter closedcorresponds with the head pressure operating horizontally of the liduicldue to the elevation of the rear tank so that as this head pressureincreases the force exerted by the pendulum for holding the valve closedcorrespondingly increases. And that even it the vehicle should becometilted up at the rear to a vertical position,- standing on its :torwardend,the pressure of the fuel in the tanlr would not open the valveagainst the resisting force exerted by the pendulum for holding itseated,

in Figures 16 to 20 there is shown a modification of the electromagneticpumping device which has some advantages for installations such as shownin Figure 1, having the entire pumping device submerged in the main fueltank. This modification comprises a casing consisting of a centralmember, 300, and lateral or end members, L 301, in the form oat capswhich are adapted to be applied to the opposite sides of the centralmember with packing gaskets, 304, 1-, interposed,

tor

the three members being held rigidly together and the joints renderedliquid-tight by an encomp assing binder, 305. In this casing there ismounted the pumpingmechanism comprising two solenoids of which the coremembers, 303, 308, are fixed in the outer ends of the respectivesolenoid tubes, 302, 302, the arr a.- ture, 807, of the right handsolenoid being mounted rigidly upon a central stern, 308, one

end of which obtains slide bearing in the right hand core member, 303.The left hand solenoid has the armature, 307*, similarly mounted rigidlyupon a stem, 309, which obtains slide hearing at the outer end in thelefthand core member, 303. The central casing member, 300, has anannular boss, 310, which affords the slide seat for the piston member,311, fitted within said annular boss and together with said annularboss, and the transaxial web, 312, of the piston, 311, constituting acomplete partition in the cavity of said central casing member, 300,dividing it into chambers, 313 and 314. In the chamber, 313, at theleft-hand side of this partition there is mounted a switch structureidentical with that shown in Figure 4 and having the several partsindicated by the'same' reference numerals and the stem, 309, of theleft-hand solenoid carries a double cone boss, 320, which operates saidswitch in the manner already described. The chamber, 313, has at thelower side two ports, 315, 315, for inlet of iuel from the main tank inwhich the entire structure is submerged, said ports being controlled bythe inwardly opening check valves, 316, 316; and said chamber has at theupper side outlet ports, 317, 317, for communication with a chamber,325, in the upper part or the casing above the chambers, 313 and 314',said ports being controlled by check valves, 318, 318, opening foroutflow, said cavity, 325, having connection at the upper side indicatedby the nipple, 326, for attaching the pipe, 10, leading tothe elevatedreserve chamber, 12, as shown and described with respect to theconstruction seen in Figures 1 and 4. The circuit connection from theignition switch to the solenoid windings is made in substantially thesame manner as the construction shown in Figure 4, the circuitwire beingled through the pipe, 10, into the chamber, 325, where the wire issecured to binding 0st, 328, which is electrically connected by spring,329, with the binding post, 330, at the inner end of which theswitch-supporting bracket, 7 3, is secured substantially as describedwith respect to the construct-ion shown in Figure 4. At the normalposition of rest with the circuit connection with the ignition switchinterrupted, so that the solenoid windings are not energized, thepiston, 311, occupies the position seen in Figure 16, and the stems,308, 309, are held in contact with the piston web by springs, 331, 331,housed in the axial bores of the cores, 303, 303. at he opposite ends ofthe piston respectively, and the armatures, 307, 307 carried by thestems, 308 and 309 respectively stand each spaced inwardly from theproximate endsof the cores respective with which the armaturesco-operate When the governing switch is closed, one or the other of thesolenoids oeing energized according to the position of the alternatingswitch 51 at that instant, the correr finding aseaaeo armature isattracted to the core, causing the piston to be drawn to one limit ofits stroke, which,assuming that to be to the righthand side of thepartition,causes fuel. to be drawn in to the chamber, 314, at theleft-hand side, and driven out from the chamber, 313, at the right-handside of the partition. This action operating to reverse the alternatingswitch 51 in the manner already described with respect to theconstruction shown in Figure 4, causes the left-hand end solenoid to beenergized and the right-hand solenoid to be (lo-energized, resulting inthe stroke of the piston in the opposite direction, drawing in the fuelto the right-hand chamber and expelling it from the left-hand chamber,the operation being thus self-repeating and maintaining pumping actionas of a doubleacting pump so long as the governing switch is closed, theoperation being in all respects similar to that described with respectto the structure shown in Figure 4. For this action it will beunderstood that the armatures are apertured as seen at 340 for free 1communication of the spaces between the armature and the core with thespaces in which the piston reciprocates for its pumping action.

The purpose served by the springs, 331, 331, reacting on the armaturefor returning them 'to the mid-position after each stroke caused by theenergizing of either co-operating core member, is that-thereby thearmature is positioned distant from the core whose winding is energizedupon the operation of the alternating switch upon the last precedingstroke, only half as far as it would otherwise be, and the force ofmagnetic attraction varying inversely as the square of the distance ofthe armature from the attracting pole, this force for starting thearmature and the pump piston is four times as great as it would havebeen if the armature were leftat the position to which it was drawn bythe attraction of the last energized core; and the length of the springbeing very short relatively to the length of the coil spring which iscompressed in the stroke, the resistance of the spring which has to beovercome by the magnetic attraction whose energy is thus stored in thecompressed spring, is not materially greater at the end than at thebeginning of the spring-compressing stroke, and the two springspractically ofi'set each other throughout the very short stroke, eachreturning the armature and piston to midposition, the diet result isthat the amount of electric energy necessary to operate the device forpumping at a given rate is reduced the magnetic element of the pump isenergized; a stroke-controlling switch device "which is automaticallyoperated oppositely hy the opposite pumping strokes for alternatelymaking and breaking the circuit connections, the circuit containing alsoa governing switch device comprisinaua member exposed to the pressure ofthe liquid pumped, and connections from said member for operating saidgovernino' switch to interrupt the circuit upon predetermined pressureof the pumped liquid on member, the fuel chamher of the carhul ter beingconnected With the discharge of he pump for fuel iioW from the pumptoward the carburetor, the governingswitch-operating member being aport-ion of the Wall said fuel chamber and exposed to the head pressureof the liquid any time contained th rein.

2. In a construction for the purpose indicated in combination with thecarburetor of an internal coinhustion engine, a magnetically operatec.pump; an electric circuit in which magnetic element of the pump isenergized; a stroke controlling switch which is automatically operatedoppositely hy the opposite pumping strokes for alternately making andbreaking the circuit connections, the carloureter havii a standpipechamber which in supplied with fuel by the pumping device, the circuitcontaining a governing switch (10-, viceu hich comprises a memberexposed to the action of he liquid in the standpipe chamber, andconnections from said mernhei for operating said governing switch tointerrupt id in said standpipe the circuit noon the lion chamherreaching predetermined depth.

3. in a construction for the purpose indicated in combination with thecarhureter of an internal combustion engine comprising a fuel chamhe' onwhich the fuel for runni lg the engine is talrcn directly by enginesuction, a magnetically or eratcd pump; an eiectric circuit in which themagnetic element of pump is energized, stroke controlling switch devicewhich is magnetically operated oppositely by opposite pumping strolresfor alternately making and breaking the circuit connections, the pump inits entirety including its stroke control ling switch memberheiugmounted adjacent to said fuel chamher the carburetor, the circuitcontaining a governing" switch device couzurising' nemher adapted to haoperated l the actio of the l quid con tamed in i Mi carburetor fuelchamber, said rovernii Witch device and its operating; member being alsomounted adjacent to said carhureter fuel chamber, and said fuel chamherhavi g port and duct for communicstiou of the liquid pressure containedtherein to said operat p" nemher.

5 L n construction to; the purpose indicated, in comhination with thecarburetor of on internal comcustion engine, and connecalternatelymaking and breaking the circuit connections, the carburetor comprising afuel chamber to which the fuel is supplied by the pumping device, thecircuit containing a governing switch device comprising a member exposedto the action of the liquid at any time contained in the fuel chamber ofthe carburetor, the tuel conduit from so fuel source to the carhureterfuel chamher having a bore affording access of the liquid pressure insaid conduit to said switch operating member, and connections from saidmember for operating said governing sui to interrupt the circuit uponthe liquid sure in said conduit mined degree.

5, In the construction defined in claim l, the s 'itcl'i-operatingmemher being adapted so to react automatically for closing the circuitupon reduction the pressure thereon of the pumped liquid below thepredetermined degree.

In combination with the carhureter of an internal combustion engine, elemechanical "fuel pumping apparatus havi connection for flow from a t'uelso having a magnet energizing circuit, means to connected with the 3source of circuit; a switch device ed for making hrealring such connecon, means operable the pressure of i pumped for operating the switch tothe circuit'upon said pressure reaching redetermined degree; a chamherin the fuel pumped may accumulate to sale .erree, the fuel flowconnection to the pu up ing apparatus hein made in cha whereby the pumpenergizing circuit i Le interrupted when the fuel level at the source issuch as to produce the predetermined degree of pressure, independently oeration of the pump; a valve positio controlling the ilou of liquid iisource to the chamber arranged to again inflow, a pendulum lever ii?chamher having; a Weighted longer a m reaching a predeten a shot r armwhich is encountered *alve at "he 1::

discharge connection leading to the engine intake manifold, amagnetically operated pump and a circuit in which the magnetic elementof the pump is energized; a governing switch mounted in the fuel chamberand operable for interrupting the current in said circuit and therebyinterrupting the pumping action; the fuel chamber having a movable wallmember exposed to the pressure of the liquid in the said fuel dischargeconnection to the intake manifold operatively connected to the governingswitch for giving the same its circuit opening. movement uponpredetermined pressure in said conduit.

8. In a construction for the purpose indicated, afuelchambe-r mounted onthe engine and having fuel discharge connection leading to the engineintake manifold; a magnetically operated pump connected for dischargewithin the fuel chamber and an electric circuit in which the magneticelement of the pump is energized, a governing switch mounted in the fuelchamber for interrupting .,the current to interrupt the pumpingacportion of the tion, the fuel chamber having a movable wall membermounted for exposure to the pressure of the liquid content of said fuelchamber, and operating connections from said member for operating saidgoverning switch arranged to interrupt the circuit upon the fuelreaching a predetermined depth in the fuel chamber. 9. The constructiondefined in claim 7 the governing-switch-operating member being a wall ofthe fuel chamber and exposed to the head pressure of the liquid at anytime contained therein.

10. In combination with a chamber in which liquid isaccumulated,pressure-producing means forso accumulating it:electro-magnetic means for controlling said pressure producing means; anelectric circuit in which said electro-Ina-gnetic means is energized; aswitch mounted in the fuel chamber controlling said circuit; the chamberhaving a movable wall member exposed to pressure of the liquidaccumulated due to its being fed to a predetermined level, andconnections from said member for operating said switch to interrupt thecircuit when the liquid reaches said level.

11. In combinat on with a chamber in which liquid is to be accumulated,pressure producing means including a magnetically operated pump for soaccumulating the liq -uid; an electric circuit in which the magneticelement of the pump is energized; a strokecontrolling switch which isautomatically operated oppositely by the opposite pumping strokes foralternately making and breaking the circuit connections, the chamberhaving a standpipe extension which is supplied with fuel by the pumpingdevice, the circuit con taining a governing switch device whichcomprises a movable member of the chamber wall inwardly exposed to theaction of the liquid'in the standpipe extension, and connections fromsaidmovable wall member for operating said governing switch to intercuitin which the magnetic element of the pump is energized, astroke-controlling switch device which is automatically operatedoppositely by the opposite pumping strokes for-alternately making andbreaking the circuit connections, the circuit containing a governingswitch device comprising a member exposed to the action of the liquid atany time contained in the accumulating chamber, the conduit from thesource to said chamber having a bore affording access of the liquidpressure in said conduit to said switch operating member, andconnections from said member for operating said governing switch tointerrupt the circuit upon the pressure in said conduit reaching apredetermined degree. i

13. In the construction defined in claim 12, the switch-operating memberbeing adapted to react automatically for closing the circuit uponreduction of the pressure thereon of the pumped liquid below thepredetermined degree.

14. The construction defined in claim 6 having the pendulum leverdimensioned relatively to the distance of the fuel tank on the vehiclerearwardly from the carbureter to cause the variation of the forceexerted by the pendulum lever upon the valve for closing it tocorrespond with the variation of the hydrostatic pressure due to therelative elevation of the fuel tank with respect to the earbureter.

In testimony whereof, I have hereunto set my hand at Chicago, Illinois,this 9th day of February, 1928.

PERCIVAL S. TICE.

